[Qemu-devel] [PATCH 2/5] Migration: Defined VMStateDescription struct for spapr_drc

[Jianjun Duan]

To manage hotplug/unplug of dynamic resources such as PCI cards,
memory, and CPU on sPAPR guests, a firmware abstraction known as
a Dynamic Resource Connector (DRC) is used to assign a particular
dynamic resource to the guest, and provide an interface for the
guest to manage configuration/removal of the resource associated
with it.

To migrate the hotplugged resources in migration, the
associated DRC state need be migrated. To migrate the DRC state,
we defined the VMStateDescription struct for spapr_drc to enable
the transmission of spapr_drc state in migration.

Not all the elements in the DRC state are migrated. Only those
ones modifiable by guest actions or device add/remove operation
are migrated.

Signed-off-by: Jianjun Duan <address@hidden>
---
 hw/ppc/spapr_drc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index 3173940..5f7a25f 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -610,6 +610,20 @@ static void spapr_dr_connector_instance_init(Object *obj)
                         NULL, NULL, NULL, NULL);
 }
 
+static const VMStateDescription vmstate_spapr_drc = {
+    .name = "spapr_drc",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields  = (VMStateField []) {
+        VMSTATE_UINT32(isolation_state, sPAPRDRConnector),
+        VMSTATE_UINT32(allocation_state, sPAPRDRConnector),
+        VMSTATE_UINT32(indicator_state, sPAPRDRConnector),
+        VMSTATE_BOOL(configured, sPAPRDRConnector),
+        VMSTATE_BOOL(awaiting_release, sPAPRDRConnector),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void spapr_dr_connector_class_init(ObjectClass *k, void *data)
 {
     DeviceClass *dk = DEVICE_CLASS(k);
@@ -618,6 +632,7 @@ static void spapr_dr_connector_class_init(ObjectClass *k, 
void *data)
     dk->reset = reset;
     dk->realize = realize;
     dk->unrealize = unrealize;
+    dk->vmsd = &vmstate_spapr_drc;
     drck->set_isolation_state = set_isolation_state;
     drck->set_indicator_state = set_indicator_state;
     drck->set_allocation_state = set_allocation_state;
-- 
1.9.1